Rod packing



Faun. '17, 1928. 1 1,656,880

F. N. MASON` Ron PACKING Filed Sepia. 16. 1926 FIC-L1.-

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FRANK N. MASON,F SOUTH BROWNSVILLE, PENNSYLVANIA, ASSIGNOR TO W. 1.JOHN. OF SOUTH BROWNSVILLE, PENNSYLVANIA.

ROD PACKING.

Application filed-September 16, 1926. Serial No. 135,786.

My invention relates to packing for piston rods, valve stems and thelike, and its ob.- ject is to provide composite packing rings which willensure {luid-tight joints under all conditions. This and other objectswill be made clear in the following description.

Referring to the accompanying drawing,

Fig. 1 is acentral longitudinal section of al stuffing-box embodying myinvention, the rod 2 being in side elevation and broken off at bot-hends; Fig.l 2, a central longitudinal cross-section of one of the metalelements of section showing the cross-sectional shape of l amodification of the ring, and Fig. 6, a section showing thecross-sectional shape of another modification of the said ring.

On the drawing, 1 designates the stuflingbox casing containing thereciprocable rod 2, surrounded by the composite packing rings 3,thegland 4, andthe cap 5, the latter being threaded to screw in the casing.The bottom of the casing preferably fits the rod closely. Above thisclosely-fitting porti/on of the stuiTng-.box casing is an annularchamber 6 having its bottom wall preferably tapered downwardly towardthe rod 2 to form an inclined seat or shoulder 7 for the correspondinglyinclined edge of the lowest packing ring 3. Preferably a plurality ofpacking rings 3 are superimposed on the seat 7 in the chamber 6, on theuppermost of which rings is seated the gland 4, preferably having itslower or inner end beveled upwardly and toward the rod-2, so as to fitthe beveled face of the cap 5 engages the top of the gland and, as it isscrewed down, causes the -gland to compress the packing rings 1n the`chamber 6 which is bounded by the inner wall of the stuiing-box casing,the rod 2, the gland 4 and the shoulder 7. Y

The lpacking rings 3 are lcomposite and are each composed "preferably ofa rlng of graphited asbestos having its inner wall seated in anoutwardly-facing channel in a metal ring 9- which bears directly on therod 2. Each ring 8 is divided orl cut entirely through diagonally atlleast at one place as shown at 10 in Fig. 1, and the ring' 9 1s cutupper end of the upper ring 3. The inner p entirely through at least atone Y place as shown at 11.

Before assembling a ring 8 with a ring 9, the flanges 12 of the ring 9are preferably at rightl angles to theintermediate portion 13 thereof.The divided flexible ring 8 can be `easily inserted in the channelformed by the flanges 12 and the portion 13. The assembled rings 8 and 9are placed in a press having their opposing pressing faces constructedto depress the'iianges 12 into the sides of the ring 8, in order thatthe flanges may form with the portion 13 a locking groove to retain therings in their assembly. Both edges of the assembled rings 3 arepreferably inclined toI correspond to the inclines on theshoulder 7 andgland 4.

The inner or 4annular portion 13 of the ring 9 has an annular groove 14facing the rod .2 and lying centrally of the portion 13, butl the outerface of the portion 13 is straight from one flange 12 to the other. Thisprovides thickened annular ribs 15 op? posite the flanges 12 and arelatively thin annular portion at the deepest part of the groove 14,whereby the pressure applied to le gland. will iiex the metal of thegroove By making the portion 13 thick at its edges and thin at itscenter, I provide a ring which' will wear much longer than it would ifthe portion 13 were of uniform thickness. At the same time I provide forthe flexing of the ring 9 at the center of the portion 13-withoutproducing distortion of the ribs 15. This is an `important matter sincedistortion of the ribs 15 would cause iiuid leaking past them.

The rings 9 are preferably made of coper.

As the rings 3 wear they become slightly loose in ,the chamber 6. Thislooseness may be taken up .by turning the cap 5 from time to time.However, yit is advisable to provide a constantly working means to takeup the looseness as it develops. This means I show in the form of`an-elastic ring 16 of spring bronze,'brass or steel. It is made from astrip of metal bent along its longitudinal center line so that itscross-section is V-shaped. Previous to this bending op erationdiamond-shaped transverse holes or slots 17 are cut in the stri as shownin Fig. 4. When the slotted ring 16 has been v slots being preferablyshaped so that when the ring 16 is formed theirv sides are parallel ortheir opposite sides come substantially together as shown at 18 in Fig.3. The inclines on the ring 16 vcorrespond to those on the rings9. 'When.the gland has compressed the rings 3 and 16, the latter through itsresilient sides constant-ly exerts pressure on the rings 3whereb`ythelatter.

are held Xedly in the chamber 6 and are compressed' longitudinally asthey wear yat ,the ribs 15. This compression of vthe rings 3 causes themto maintain a tight fit against the rod 2. y

The constant tendency of the outwardly Haring sides of the resilientring 16 to increase the angle between thesides has two resultants, oneparallel with the rod 2 and the other radial thereof. The firstresultant compresses the packing in a direction parallel with .the rodand causes it to expand radially and thereby keep it in cl'ose contactwith the rod as the packing wears or the packing itself becomes denser.The first resultant also keeps the packing rings tight against the ring16, the shoulder 7 and the' gland 4, and at the same timeputs a pressureon the cap 5V which tends to keep it from accidentally unscrewing. Thesecond resultant acts radially toward the rod 2. It acts as if aseparate force were pushing' the packin rings constantly directlyagainst the shaigt..

In Fig. 5, the ring 9'I has a central rib 15a with two grooves 14, andin Fig. 6 the ring 9b is without a groove in its intermediate portion,but it has diagonal slots 19 to cause the said portion to flex morereadily under pressure without distortion of the portions opposite theianges 12.

I claimv 1. The combination of a reciprocable rod, a stuiing boxsurrounding the rod, a plurality ofv alined iexible metal rings betweenthe stuliing box andthe rod, each ring comprising a metal `channel withits back against the4 rod and its flanges projecting outwardly andconverging toward each other, airing of yielding packing materialfitting each'channel, a resilient metal ring, `V-shaped in cross-sectionseated between adjacent metal rings and 'having its vertex next to therod and its flaring sides bearing against lthe edges of adjacent metalrings, and a gland surrounding the rod and exerting pressure on theoutermost metal ring,

the surfaces of the stuiiing box and the `gland which engage the ends ofthe innermost and the outermost metal rin s being beveled to correspondto the ends o the adjacent metal rings. 4.

' 2. The combination of a reciprocable rod, a stuliingV box surroundingthe rod, a `plurality of alined flexible metal rings between the stuiingbox and the rod, .each ring `comprising a metal channel with its backagainst the rod and its anges projecting outwardly and converging towardeach other, a' ring of yielding packing material fitting each channel, aresilient metal rin V-shaped in cross-section seated between a jacentmetal rings' and having t its vertex next to the rod and its Haringsides bearing against the edges of adjacent metal rings,

and a gland surrounding the rod and ex erting pressure on the outermostmetalring.

3. Apacking including two compressi packing-rings strung on areciprocable rod, and a resilient ring adapted to bevseated betweenconsecutive packing rings and to exert constant pressure against Aeachof the rings when the packing is under com ression, .the resilient :ringbeing compose of spring material V-shaped in cross-section and itsvertex being next to the rod.-

Intestimony whereof, I hereunto aix my signature. l FRANK N. MASON.

